General Description
The RT5752 is a simple, easy-to-use, 2A synchronous
step-down DC-DC converter with an input supply voltage
range from 2.5V to 6V. The device builds in an accurate
0.6V reference voltage and integrates low RDS(ON) power
MOSFETs to achieve high efficiency in TSOT-23-5,
TSOT-23-6 and WDFN-6L 2x2 packages.
The RT5752 adopts Advanced Constant On-Time (ACOT®)
control architecture to provide an ultrafast transient
response with few external components and to operate in
nearly constant switching frequency over the line, load,
and output voltage range. The RT5752A operates in
automatic PSM that maintains high efficiency during light
load operation. The RT5752B operates in Forced PWM
that helps to meet tight voltage regulation accuracy
requirements.
The RT5752 senses both FETs current for a robust overcurrent protection. The device features cycle-by-cycle
current limit protection which prevents the device from
the catastrophic damage in output short circuit, over current
or inductor saturation. A built-in soft-start function prevents
inrush current during start-up. The device also includes
input under-voltage lockout, output under-voltage
protection, over-voltage protection (RT5752AL/BL) and
over-temperature protection to provide safe and smooth
operation in all operating conditions.

Features
 Input Voltage Range from 2.5V to 6V
 Integrated 100mΩ and 70mΩ FETs
 100% Duty Cycle for Lowest Dropout
 Internal Reference Voltage with 1% Accuracy
 1.2MHz Typical Switching Frequency
 Power Saving Mode for Light Loads (RT5752A)
 Advanced Constant On-Time (ACOT® ) Control
 Internal Soft Startup (1.5ms)
 Enable Control Input
 Power Good Indicator
 Negative Over-Current Protection (RT5752B)
 Fully Protection with UVLO, OVP, UVP, Cycle-byCycle Current Limit and OTP
 RoHS Compliant and Halogen Free

Applications
 Mobile Phones and Handheld Devices
 STB, Cable Modem, and xDSL Platforms
 WLAN ASIC Power / Storage (SSD and HDD)
 General Purpose for POL LV Buck Converters